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          <h1 class="post-title" itemprop="name headline">CVE-2019-11043 PHP远程代码执行漏洞</h1>
        

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        <h2 id="漏洞描述"><a href="#漏洞描述" class="headerlink" title="漏洞描述"></a>漏洞描述</h2><p>CVE-2019-11043 是一个远程代码执行漏洞，使用某些特定配置的 Nginx + PHP-FPM 的服务器存在漏洞，可允许攻击者远程执行代码。<br>向<code>Nginx + PHP-FPM</code>的服务器 URL发送 <code>%0a</code> 时，服务器返回异常。<br>该漏洞需要在<code>nginx.conf</code>中进行特定配置才能触发。具体配置如下：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line">location ~ [^/]\.php(/|$) &#123;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> ...</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> fastcgi_split_path_info ^(.+?\.php)(/.*)$;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> fastcgi_param PATH_INFO $fastcgi_path_info;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> fastcgi_pass   php:9000;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> ...</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<a id="more"></a>
<p>对于nginx的配置信息不太懂的可以看这两篇博客<a href="https://blog.csdn.net/wangbin_0729/article/details/82109693" target="_blank" rel="noopener">Nginx的配置文件详解（超详细）</a>、<a href="https://snowstar.org/2017/12/11/nginx-with-php-and-path-info/" target="_blank" rel="noopener">Nginx 与 PHP 的正确使用姿势 ( 以及 PATH_INFO )</a><br>看了这两篇博客后，我们可以了解到这种特定的配置一般出现在基于<code>PATH_INFO</code>运行的程序,并且使用了nginx的<code>fastcgi_split_path_info</code>功能。<br>攻击者可以使用换行符（％0a）来破坏fastcgi_split_path_info指令中的Regexp。Regexp被损坏导致PATH_INFO为空，从而触发该漏洞。</p>
<h2 id="影响范围"><a href="#影响范围" class="headerlink" title="影响范围"></a>影响范围</h2><p>在 Nginx + PHP-FPM 环境下，当启用了上述 Nginx 配置后，以下 PHP 版本受本次漏洞影响，另外，PHP 5.6版本也受此漏洞影响，但目前只能 Crash，不可以远程代码执行：</p>
<ul>
<li>PHP 7.0 版本</li>
<li>PHP 7.1 版本</li>
<li>PHP 7.2 版本</li>
<li>PHP 7.3 版本</li>
</ul>
<h2 id="漏洞复现"><a href="#漏洞复现" class="headerlink" title="漏洞复现"></a>漏洞复现</h2><p>使用 p 神的 docker 环境进行复现：<br>PHP-FPM 远程代码执行漏洞（CVE-2019-11043）<br><a href="https://github.com/vulhub/vulhub/blob/master/php/CVE-2019-11043/README.zh-cn.md" target="_blank" rel="noopener">https://github.com/vulhub/vulhub/blob/master/php/CVE-2019-11043/README.zh-cn.md</a><br>准备工作：安装 docker、golang 环境</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">sudo apt-get install docker docker-compose</span><br><span class="line">sudo apt-get install golang-go</span><br></pre></td></tr></table></figure>
<h3 id="搭建漏洞环境"><a href="#搭建漏洞环境" class="headerlink" title="搭建漏洞环境"></a>搭建漏洞环境</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">git clone https://github.com/vulhub/vulhub.git</span><br><span class="line">cd vulhub/php/CVE-2019-11043 &amp;&amp; sudo docker-compose up -d</span><br></pre></td></tr></table></figure>
<p>启动环境之后，就可以看到漏洞环境的默认页面。在此为 <code>http://127.0.0.1:8080/index.php</code>。<br>在虚拟机下搭建环境时，需要把IP地址换为虚拟机对应IP，我这里为<code>192.168.26.129</code>。<br><code>index.php</code>文件内容很简单</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span></span><br><span class="line"><span class="keyword">echo</span> <span class="string">"hello world"</span>;</span><br></pre></td></tr></table></figure>
<p><img src="//desperadoccy.github.io/2019/10/31/CVE-2019-11043/1.png" alt="test"></p>
<p>由此可见，这题主要是nginx解析URL时产生的问题，不管php后端代码如何，都可以利用此漏洞（感觉说了句废话）</p>
<h3 id="安装漏洞利用工具"><a href="#安装漏洞利用工具" class="headerlink" title="安装漏洞利用工具"></a>安装漏洞利用工具</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">git clone https://github.com/neex/phuip-fpizdam.git</span><br><span class="line">cd phuip-fpizdam</span><br><span class="line">go get &amp;&amp; go build</span><br></pre></td></tr></table></figure>
<p><img src="//desperadoccy.github.io/2019/10/31/CVE-2019-11043/2.png" alt="test"></p>
<h2 id="漏洞利用"><a href="#漏洞利用" class="headerlink" title="漏洞利用"></a>漏洞利用</h2><p>我脚本放在虚拟机里，所以这边的url还是<code>127.0.0.1</code><br>在漏洞利用工具目录下执行此命令<code>go run . &quot;http://127.0.0.1/index.php&quot;</code><br><img src="//desperadoccy.github.io/2019/10/31/CVE-2019-11043/3.png" alt="test"><br>至此，我们就可以在index.php GET传递a变量进行shell操作<br>中间重启了虚拟机，因此IP地址发生变化<br><img src="//desperadoccy.github.io/2019/10/31/CVE-2019-11043/4.png" alt="test"><br>攻击成功</p>
<h2 id="漏洞分析"><a href="#漏洞分析" class="headerlink" title="漏洞分析"></a>漏洞分析</h2><p>直接放创宇404实验室的文章吧(PHP-fpm 远程代码执行漏洞(CVE-2019-11043)分析)[<a href="https://paper.seebug.org/1063/]" target="_blank" rel="noopener">https://paper.seebug.org/1063/]</a></p>
<h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><p><a href="http://blog.leanote.com/post/snowming/9da184ef24bd" target="_blank" rel="noopener">http://blog.leanote.com/post/snowming/9da184ef24bd</a><br><a href="https://mp.weixin.qq.com/s?__biz=MzU1NjgzOTAyMg==&amp;mid=2247485345&amp;idx=1&amp;sn=4d358d3435c9d0a7c13173ec0ba3f559&amp;chksm=fc3fbea0cb4837b65bb449922b27793969a67700ed9c6134efd5fae0043dadde1041c64a3be1&amp;mpshare=1&amp;scene=23&amp;srcid=1030qPdsWON6ZDUHhWFE3nnf&amp;sharer_sharetime=1572436263630&amp;sharer_shareid=1d8a838b3dca08264ec18b21bbebc7f8#rd" target="_blank" rel="noopener">PHP远程代码执行漏洞复现（CVE-2019-11043）【反弹shell成功】</a><br><a href="https://paper.seebug.org/1063/" target="_blank" rel="noopener">PHP-fpm 远程代码执行漏洞(CVE-2019-11043)分析</a></p>

      
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